Extract debug signing key from certificate logic into a macro.
It makes it easier to reuse in other macros and improves readability.
Bug: 276928228
Test: CI
Change-Id: I552eb8d655ef66e17eb81f8cac924b66c4b0184f
The code in this directory is experimental. Bazel support for Android Platform is undergoing active development and workflow stability is currently not guaranteed.